remove "high priority" code; not marked [Obsolete] yet

StackExchange.Redis/StackExchange/Redis/ConnectionMultiplexer.cs

@@ -305,8 +305,9 @@ internal void MakeMaster(ServerEndPoint server, ReplicationChangeOptions options
 
             if (log == null) log = TextWriter.Null;
             CommandMap.AssertAvailable(RedisCommand.SLAVEOF);
-
+#pragma warning disable CS0618
             const CommandFlags flags = CommandFlags.NoRedirect | CommandFlags.HighPriority;
+#pragma warning restore CS0618
             Message msg;
 
             LogLocked(log, "Checking {0} is available...", Format.ToString(srv.EndPoint));
@@ -1275,8 +1276,9 @@ internal async Task<bool> ReconfigureAsync(bool first, bool reconfigureAll, Text
                     {
                         throw new InvalidOperationException("No nodes to consider");
                     }
-
+#pragma warning disable CS0618
                     const CommandFlags flags = CommandFlags.NoRedirect | CommandFlags.HighPriority;
+#pragma warning restore CS0618
                     List<ServerEndPoint> masters = new List<ServerEndPoint>(endpoints.Count);
                     bool useTieBreakers = !string.IsNullOrWhiteSpace(configuration.TieBreaker);
 

StackExchange.Redis/StackExchange/Redis/Enums/CommandFlags.cs

@@ -13,8 +13,9 @@ public enum CommandFlags
         /// </summary>
         None = 0,
         /// <summary>
-        /// This command may jump regular-priority commands that have not yet been written to the redis stream.
+        /// From 2.0, this flag is not used
         /// </summary>
+        // [Obsolete("From 2.0, this flag is not used", false)]
         HighPriority = 1,
         /// <summary>
         /// The caller is not interested in the result; the caller will immediately receive a default-value

StackExchange.Redis/StackExchange/Redis/Message.cs

@@ -65,7 +65,9 @@ internal abstract class Message : ICompletable
                                                        | CommandFlags.DemandSlave
                                                        | CommandFlags.PreferMaster
                                                        | CommandFlags.PreferSlave
+#pragma warning disable CS0618
                                                        | CommandFlags.HighPriority
+#pragma warning restore CS0618
                                                        | CommandFlags.FireAndForget
                                                        | CommandFlags.NoRedirect
                                                        | CommandFlags.NoScriptCache;
@@ -199,9 +201,6 @@ internal void SetScriptUnavailable()
         }
 
         public bool IsFireAndForget => (flags & CommandFlags.FireAndForget) != 0;
-
-        public bool IsHighPriority => (flags & CommandFlags.HighPriority) != 0;
-
         public bool IsInternalCall => (flags & InternalCallFlag) != 0;
 
         public ResultBox ResultBox => resultBox;

StackExchange.Redis/StackExchange/Redis/ServerEndPoint.cs

@@ -261,8 +261,9 @@ internal void AutoConfigure(PhysicalConnection connection)
             }
 
             var commandMap = Multiplexer.CommandMap;
+#pragma warning disable CS0618
             const CommandFlags flags = CommandFlags.FireAndForget | CommandFlags.HighPriority | CommandFlags.NoRedirect;
-
+#pragma warning restore CS0618
             var features = GetFeatures();
             Message msg;
 
@@ -514,7 +515,9 @@ internal bool CheckInfoReplication()
             if (version >= RedisFeatures.v2_8_0 && Multiplexer.CommandMap.IsAvailable(RedisCommand.INFO)
                 && (bridge = GetBridge(ConnectionType.Interactive, false)) != null)
             {
+#pragma warning disable CS0618
                 var msg = Message.Create(-1, CommandFlags.FireAndForget | CommandFlags.HighPriority | CommandFlags.NoRedirect, RedisCommand.INFO, RedisLiterals.replication);
+#pragma warning restore CS0618
                 msg.SetInternalCall();
                 WriteDirectFireAndForget(msg, ResultProcessor.AutoConfigure, bridge);
                 return true;